EP1979223A1 - Sous ensemble de vehicule automobile adapte a etre integre dans un element de carrosserie du vehicule - Google Patents
Sous ensemble de vehicule automobile adapte a etre integre dans un element de carrosserie du vehiculeInfo
- Publication number
- EP1979223A1 EP1979223A1 EP07731543A EP07731543A EP1979223A1 EP 1979223 A1 EP1979223 A1 EP 1979223A1 EP 07731543 A EP07731543 A EP 07731543A EP 07731543 A EP07731543 A EP 07731543A EP 1979223 A1 EP1979223 A1 EP 1979223A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- subassembly
- vehicle
- membrane
- orifices
- subset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012528 membrane Substances 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 230000008901 benefit Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910002110 ceramic alloy Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229920001746 electroactive polymer Polymers 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D35/00—Vehicle bodies characterised by streamlining
- B62D35/007—Rear spoilers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D37/00—Stabilising vehicle bodies without controlling suspension arrangements
- B62D37/02—Stabilising vehicle bodies without controlling suspension arrangements by aerodynamic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C2230/00—Boundary layer controls
- B64C2230/02—Boundary layer controls by using acoustic waves generated by transducers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/82—Elements for improving aerodynamics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/10—Drag reduction
Definitions
- the present invention relates to a subassembly of a motor vehicle adapted to be integrated into a bodywork element of the vehicle.
- the subassembly according to FR2859160 is intended to generate air flows through the orifices to reduce the aerodynamic drag of the vehicle when it is in motion, by controlling air flows on the bodywork.
- This control is an effective way to reduce the resistance to movement in the air and therefore to reduce the energy consumption of said vehicle.
- this control can be used to improve the dynamic stability of the vehicle.
- the drag reduction is performed by the actuator which slidably moves a tubular member slidably mounted in a cylindrical recess.
- the tubular member is alternately driven in translation to alternately vary the volume of chambers at each end of the tubular member, each chamber communicating with slots forming the orifices to generate the air flow.
- the actuator according to FR2859160 can be bulky, which poses problems for integration into a vehicle at locations where the available space is counted, especially if it is necessary to implement several subsets.
- EP1544089 discloses an aerodynamic flow control device for equipped a motor vehicle.
- EP0315806 describes an aerodynamic device with electromagnet which has the disadvantage of having a certain inertia and which can also be bulky.
- WO99 / 26457 describes a miniature device with synthetic jet for electronic apparatus, for a specific ventilation of component. It does not allow to act on a large area such as a motor vehicle surface.
- the invention aims to improve the various solutions proposed above.
- the invention relates to a subassembly of a motor vehicle adapted to be integrated into a bodywork element of the vehicle, the subassembly having an outer panel defining an aerodynamic device orifice which comprises a chamber whose volume is variable.
- the subassembly comprises a plurality of orifices of a plurality of aerodynamic devices, each device comprising at least one of said orifices and having a wall which delimits the chamber and has a membrane whose movement is driven by reaction of a material of membrane to the application of a voltage.
- Two adjacent chambers of two adjacent devices have a common wall with a common membrane.
- the material of the membrane comprises an electroactive or piezoelectric polymer material
- each device comprises a plurality of membranes
- each chamber comprises a plurality of orifices
- the wall presenting the membrane is substantially parallel to the panel delimiting the orifice
- the wall presenting the membrane is substantially perpendicular to the panel delimiting the orifice
- the orifice is a slot
- the orifices are slots aligned in a manner forming an opening in the form of a continuous appearance slot
- the invention also relates to a vehicle which comprises at least one subassembly according to the invention.
- the vehicle comprises means for controlling the application of the electric voltage according to at least one determined frequency.
- the voltage applied in a first device of the subset may be different from the voltage applied at the same time and at least temporarily to a second device of the subset.
- the voltage applied in a first device of the subset may be identical to the voltage applied at the same time and at least temporarily to a second device of the subset.
- FIG. 1 is a perspective view of three quarter rear and top of a vehicle comprising a subassembly according to the invention
- FIG. 2 is a sectional view of a subassembly device according to the invention
- FIG. 3 is a perspective view of a first embodiment of a subassembly according to the invention
- FIG. 4 is a perspective view of a second embodiment of a subassembly according to the invention.
- FIG. 5 to 8 are perspective views of various embodiments of subassembly devices according to the invention.
- the designated direction L is the longitudinal direction corresponding to the axis of advance of a vehicle
- the designated direction T is transverse
- the direction designated V is vertical.
- the L axis is oriented from front to rear of the vehicle, the T axis from left to right and the V axis from bottom to top.
- an automobile vehicle is equipped with subassemblies 20 integrated in a bodywork element, here the roof of the vehicle.
- a subassembly 20 near the windshield and a subassembly near the rear window.
- Each subassembly is located at a location where air is likely to flow in the vicinity of the outer roof surface 22 forming a boundary layer between a highly disturbed air gap near the outer surface 22 and a blade undisturbed air remote from the outer surface 22, when the motor vehicle is in motion.
- Each subassembly, assembled to the flag has a portion of the outer surface 22 on an outer panel 24 defining an orifice 26 of aerodynamic device.
- Each device comprises a chamber 30 whose volume is variable by the movement of a membrane 32, the chamber being open at the orifice 26.
- each device comprises a rectangular parallelepiped chamber.
- the subassembly 20 comprises a plurality of orifices 26 of a plurality of aerodynamic devices, each device comprising at least one of said orifices 26 and comprising one of said chambers 30.
- the membrane 32 is placed directly on at least one of the walls which delimits the chamber 30.
- the movement of the membrane 32 is driven by reaction of a material of the membrane to the application of a electric tension.
- the material of the membrane comprises an electroactive polymer material of the type known to those skilled in the art in document US2003 / 02141 99.
- the operating principle is the application of a voltage across the terminals. electrodes deposited on an insulating polymer layer, the voltage (direct current) inducing a potential difference between the two electrodes and a deformation of the polymer.
- the advantages of a membrane with electro-active polymer are: high deformation capacity, high and low frequency operation and in a wide range of temperatures, quiet operation, high specific energy (higher than electro-ceramic materials or alloys with shape memory), response time of the order of a thousandths of a second, low cost of production.
- the membrane material comprises a piezoelectric material, of the type known to those skilled in the art WO99 / 26457.
- a piezoelectric ceramic is bonded to a metal support forming the membrane.
- the advantage of a piezoelectric membrane according to the invention is that it ensures a fast operating regime up to high frequencies (around KHz) in a wide range of temperatures, with a fast response time. of the order of the mi llisecond. Its energy consumption is minimal compared to that consumed by electro actuators acting on a piston. Its mass is very low, as is its cost and size.
- the jet velocity at the outlet of the orifice is a function of the supply voltage of the piezoelectric membrane.
- the wall having the membrane 32 is the bottom wall of the cavity 30 which is substantially parallel to the panel deli mitant the orifice, at a distance from the latter.
- This type of device is compact enough to be integrated into a subassembly having a plurality of devices in a vehicle deck.
- the devices of the subassembly are arranged according to a tiling, each paving device being in accordance with the embodiment of FIG. 2.
- the chamber is substantially three times longer than wide and high. It is possible that the chamber is even longer than its height and width. In the embodiments shown in FIGS. 4, 5 and
- Each device of the subset comprises a plurality of membranes.
- the membranes of each device are powered in phase in the case of the embodiments of Figures 5 and 7, the membranes being aligned on the same wall.
- each chamber 30 has a plurality of orifices.
- the orifices are of circular section and are aligned along the length of the panel 24 of the chamber.
- the orifices are slots and are aligned in parallel along the length of the panel 24 of the chamber.
- the wall having the membrane 32 or the membranes 32 is substantially perpendicular to the panel 24 defining the orifice.
- two adjacent chambers of two adjacent devices comprise a common wall with a common membrane.
- the membranes of each device are powered in phase opposition in the case of the embodiment of Figure 4, the membranes being on opposite walls of the same chamber.
- the compression caused by the displacement of a membrane 32 within a chamber 30 results in an extension in the adjacent chamber 30 and two synthetic jets are produced alternately in one period of the control signal. These two adjacent jets entrain the surrounding air, interact with each other and mingle in a single larger jet downstream of the chamber 30.
- each membrane 32 Since each membrane 32 is surrounded by air in chambers 30, the pressure difference across each membrane 32 is small. Much of the energy for moving each membrane 32 is therefore used to create the synthetic air jet. With this feature, there is more need for a source of electrical energy as powerful as those of the prior art for controlling the membrane 32 when the The pressure difference between the air inside and the air outside the chamber 30 is important.
- the subassembly comprises an opening in the form of a long continuous appearance slot which can for example be placed just behind a vehicle windshield for the treatment of the flow on the roof, for the benefit of the reduction of the consumption, possibly combined with the benefit of the reduction of the noise in the cabin of the vehicle.
- An alternative is to also end devices in a subset, but removing the wall separating two adjacent devices to have a subset equivalent to a long device as shown in Figures 7 and 8.
- the vehicle comprises means for controlling the application of the voltage in the membranes according to at least one determined frequency. For example, in a first mode of operation, at least temporarily, the voltage applied in a first device of the subassembly is different than the voltage applied at the same time to a second device of the subassembly. In a second mode of operation, at least temporarily, the voltage applied in a first device of the subset may be identical to the voltage applied at the same time to a second device of the subset.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
- Body Structure For Vehicles (AREA)
- Combined Devices Of Dampers And Springs (AREA)
- Fluid-Damping Devices (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0650371A FR2896758B1 (fr) | 2006-02-02 | 2006-02-02 | Sous ensemble de vehicule automobile adapte a etre integre dans un element de carrosserie du vehicule |
| PCT/FR2007/050715 WO2007088310A1 (fr) | 2006-02-02 | 2007-01-31 | Sous ensemble de vehicule automobile adapte a etre integre dans un element de carrosserie du vehicule |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1979223A1 true EP1979223A1 (fr) | 2008-10-15 |
| EP1979223B1 EP1979223B1 (fr) | 2009-11-25 |
Family
ID=36930302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07731543A Ceased EP1979223B1 (fr) | 2006-02-02 | 2007-01-31 | Sous ensemble de vehicule automobile adapte a etre integre dans un element de carrosserie du vehicule |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1979223B1 (fr) |
| AT (1) | ATE449722T1 (fr) |
| DE (1) | DE602007003439D1 (fr) |
| FR (1) | FR2896758B1 (fr) |
| WO (1) | WO2007088310A1 (fr) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2924627A1 (fr) * | 2007-12-11 | 2009-06-12 | Renault Sas | Dispositif d'alimentation d'un ensemble d'actionneurs a membranes en polymere electro-actif |
| FR2924628B1 (fr) * | 2007-12-11 | 2010-01-22 | Renault Sas | Dispositif d'alimentation d'un ensemble d'actionneurs a membranes en polymere electro-actif |
| FR2924629B1 (fr) * | 2007-12-11 | 2012-12-14 | Renault Sas | Dispositif d'alimentation d'un ensemble d'actionneurs a membranes en materiau piezoelectrique |
| FR2930229B1 (fr) * | 2008-04-16 | 2010-09-03 | Renault Sas | Agencement d'un dispositif de generation d'au moins un jet de gaz sur une carrosserie de vehicule automobile |
| ATE479567T1 (de) * | 2008-05-06 | 2010-09-15 | Fiat Ricerche | Luftdiffusor oder verteilungsvorrichtung mit synthetischen düsen |
| FR2935676B1 (fr) * | 2008-09-09 | 2010-10-08 | Renault Sas | Dispositif generateur des jets synthetiques d'air pour vehicule |
| DE102012012448B4 (de) * | 2012-06-25 | 2022-02-03 | Volkswagen Aktiengesellschaft | Luftströmungserzeugungsvorrichtung, Verwendung einer solchen und Kraftfahrzeug |
| GB201213451D0 (en) | 2012-07-27 | 2012-09-12 | Imp Innovations Ltd | Drag reduction |
| US9586632B2 (en) | 2014-11-14 | 2017-03-07 | Embry-Riddle Aeronautical University, Inc. | Optimizing jets for wake control of ground vehicles |
| FR3031719B1 (fr) * | 2015-01-21 | 2017-02-17 | Plastic Omnium Cie | Systeme aerodynamique a generateur de vortex orientable |
| FR3032917B1 (fr) * | 2015-02-20 | 2017-02-17 | Valeo Systemes Thermiques | Module de conditionnement d'air d'un habitacle de vehicule automobile |
| US20200180711A1 (en) * | 2018-12-07 | 2020-06-11 | GM Global Technology Operations LLC | Piezoelectric bellow configured to reduce drag |
| US20200198711A1 (en) * | 2018-12-20 | 2020-06-25 | GM Global Technology Operations LLC | Piezoelectric bellow configured to control downforce |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7320457B2 (en) * | 1997-02-07 | 2008-01-22 | Sri International | Electroactive polymer devices for controlling fluid flow |
| US6543719B1 (en) * | 1997-06-05 | 2003-04-08 | Mcdonnell Douglas Helicopter Co. | Oscillating air jets for implementing blade variable twist, enhancing engine and blade efficiency, and reducing drag, vibration, download and ir signature |
| AU2002255688A1 (en) * | 2001-03-10 | 2002-09-24 | Georgia Tech Research Corporation | Modification of fluid flow about bodies and surfaces through virtual aero-shaping of airfoils with synthetic jet actuators |
| ITTO20031019A1 (it) * | 2003-12-18 | 2005-06-19 | Fiat Ricerche | Autoveicolo con dispositivo di controllo del flusso aerodinamico utilizzante getti sintetici. |
-
2006
- 2006-02-02 FR FR0650371A patent/FR2896758B1/fr not_active Expired - Fee Related
-
2007
- 2007-01-31 DE DE602007003439T patent/DE602007003439D1/de active Active
- 2007-01-31 WO PCT/FR2007/050715 patent/WO2007088310A1/fr not_active Ceased
- 2007-01-31 AT AT07731543T patent/ATE449722T1/de not_active IP Right Cessation
- 2007-01-31 EP EP07731543A patent/EP1979223B1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007088310A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007088310A1 (fr) | 2007-08-09 |
| ATE449722T1 (de) | 2009-12-15 |
| EP1979223B1 (fr) | 2009-11-25 |
| DE602007003439D1 (de) | 2010-01-07 |
| FR2896758A1 (fr) | 2007-08-03 |
| FR2896758B1 (fr) | 2009-10-23 |
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